Artículos de revistas
Trace Levels Determination of Ammonium by Flow Injection Analysis Using Gas-Diffusion and Capacitively Coupled Contactless Conductivity Detection
Registro en:
Electroanalysis. Wiley-blackwell, v. 23, n. 11, n. 2594, n. 2600, 2011.
1040-0397
WOS:000297311500015
10.1002/elan.201100317
Autor
Braz, HL
Ito, DT
da Silva, JAF
do Lago, CL
Pedrotti, JJ
Institución
Resumen
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) A sensitive analytical method based on gas-diffusion flow injection system for ammonium ion determination at trace levels with capacitively coupled contactless conductivity detection (C(4)D) is described. The effects of the chemical composition of the acceptor stream, operating frequency of the conductivity detector, acceptor and donor flow rates, injected volume, and some potential interferents were evaluated. By injecting 100 mu L samples, the analytical method showed linear response for ammonium from 2.0 up to 100 mu mol L(-1) and a limit of detection of 0.8 mu mol L(-1) (14 ppb). At a flow rate of 0.10 mL min(-1) for the acceptor solution, an analytical throughput of 35 injections per hour was achieved. The new flow injection system was successfully applied for ammonium determination in rainwater from Sao Paulo city. 23 11 2594 2600 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Mackpesquisa Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP [2008/53868-0, 2008/57805-2]